Added Chinese and Portuguese (Brazil) translation
Added support for gzip-encoded downloads. Closes #89.
Updated CONTRIBUTORS file
Updated test project config files
FeedManager now checks if episode file exists before playing.
PlaybackController now checks if episode exists when the restoring last
played episode.
Increased socket and connection timeout of HTTP downloader
Prepared release of version 0.9.6.4
Release PlaybackController when MediaplayerActivity is stopped
Updated list of test feeds